Canberra: In a breakthrough initiative aimed at addressing both climate change and agricultural costs, scientists in Australia are exploring the potential of crushed volcanic rock to support more sustainable farming practices.
Led by Dr. Binoy Sarkar of the University of South Australia’s Future Industries Institute, researchers are trialling crushed basalt—a low-cost by-product of mining and construction—as a natural soil enhancer. Priced at just AU$30 (US$19.69) per ton, the rock is being tested for its ability to lower soil acidity, improve crop yields, and capture carbon, all while utilizing standard farming equipment.
“Farmers across Australia currently spend around AU$1.2 billion annually to combat soil acidification, often relying on costly lime materials that contribute to greenhouse gas emissions themselves,” Dr. Sarkar said. “Basalt offers a more sustainable and affordable alternative.”
Beyond neutralizing acidic soils, basalt is rich in nutrients like silicon, calcium, magnesium, and phosphorus, potentially reducing the need for synthetic fertilizers and improving farm profitability.
The research—funded through national and private partnerships—also includes collaboration with James Cook University, the Tropical North Queensland Drought Hub, and various industry stakeholders. Preliminary findings suggest that basalt could significantly reduce agricultural emissions, which currently account for 18% of Australia’s total greenhouse gas output.
With the federal goal of reaching net-zero emissions by 2050, the team believes widespread adoption of basalt could not only benefit farmers, but also offer carbon credit opportunities to mining companies by repurposing what would otherwise be waste material.
“Building trust through ongoing trials is crucial,” said Sarkar. “If proven effective, this innovation could transform both farming and resource management, paving the way for greener and more resilient agriculture across the nation.”
